builtin-mktree.c

   1 /*
   2  * GIT - the stupid content tracker
   3  *
   4  * Copyright (c) Junio C Hamano, 2006, 2009
   5  */
   6 #include "builtin.h"
   7 #include "quote.h"
   8 #include "tree.h"
   9
  10 static struct treeent {
  11         unsigned mode;
  12         unsigned char sha1[20];
  13         int len;
  14         char name[FLEX_ARRAY];
  15 } **entries;
  16 static int alloc, used;
  17
  18 static void append_to_tree(unsigned mode, unsigned char *sha1, char *path)
  19 {
  20         struct treeent *ent;
  21         int len = strlen(path);
  22         if (strchr(path, '/'))
  23                 die("path %s contains slash", path);
  24
  25         if (alloc <= used) {
  26                 alloc = alloc_nr(used);
  27                 entries = xrealloc(entries, sizeof(*entries) * alloc);
  28         }
  29         ent = entries[used++] = xmalloc(sizeof(**entries) + len + 1);
  30         ent->mode = mode;
  31         ent->len = len;
  32         hashcpy(ent->sha1, sha1);
  33         memcpy(ent->name, path, len+1);
  34 }
  35
  36 static int ent_compare(const void *a_, const void *b_)
  37 {
  38         struct treeent *a = *(struct treeent **)a_;
  39         struct treeent *b = *(struct treeent **)b_;
  40         return base_name_compare(a->name, a->len, a->mode,
  41                                  b->name, b->len, b->mode);
  42 }
  43
  44 static void write_tree(unsigned char *sha1)
  45 {
  46         struct strbuf buf;
  47         size_t size;
  48         int i;
  49
  50         qsort(entries, used, sizeof(*entries), ent_compare);
  51         for (size = i = 0; i < used; i++)
  52                 size += 32 + entries[i]->len;
  53
  54         strbuf_init(&buf, size);
  55         for (i = 0; i < used; i++) {
  56                 struct treeent *ent = entries[i];
  57                 strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
  58                 strbuf_add(&buf, ent->sha1, 20);
  59         }
  60
  61         write_sha1_file(buf.buf, buf.len, tree_type, sha1);
  62         strbuf_release(&buf);
  63 }
  64
  65 static const char mktree_usage[] = "git mktree [-z]";
  66
  67 int cmd_mktree(int ac, const char **av, const char *prefix)
  68 {
  69         struct strbuf sb = STRBUF_INIT;
  70         struct strbuf p_uq = STRBUF_INIT;
  71         unsigned char sha1[20];
  72         int line_termination = '\n';
  73
  74         while ((1 < ac) && av[1][0] == '-') {
  75                 const char *arg = av[1];
  76                 if (!strcmp("-z", arg))
  77                         line_termination = 0;
  78                 else
  79                         usage(mktree_usage);
  80                 ac--;
  81                 av++;
  82         }
  83
  84         while (strbuf_getline(&sb, stdin, line_termination) != EOF) {
  85                 char *ptr, *ntr;
  86                 unsigned mode;
  87                 enum object_type type;
  88                 char *path;
  89
  90                 ptr = sb.buf;
  91                 /*
  92                  * Read non-recursive ls-tree output format:
  93                  *     mode SP type SP sha1 TAB name
  94                  */
  95                 mode = strtoul(ptr, &ntr, 8);
  96                 if (ptr == ntr || !ntr || *ntr != ' ')
  97                         die("input format error: %s", sb.buf);
  98                 ptr = ntr + 1; /* type */
  99                 ntr = strchr(ptr, ' ');
 100                 if (!ntr || sb.buf + sb.len <= ntr + 40 ||
 101                     ntr[41] != '\t' ||
 102                     get_sha1_hex(ntr + 1, sha1))
 103                         die("input format error: %s", sb.buf);
 104                 type = sha1_object_info(sha1, NULL);
 105                 if (type < 0)
 106                         die("object %s unavailable", sha1_to_hex(sha1));
 107                 *ntr++ = 0; /* now at the beginning of SHA1 */
 108                 if (type != type_from_string(ptr))
 109                         die("object type %s mismatch (%s)", ptr, typename(type));
 110
 111                 path = ntr + 41;  /* at the beginning of name */
 112                 if (line_termination && path[0] == '"') {
 113                         strbuf_reset(&p_uq);
 114                         if (unquote_c_style(&p_uq, path, NULL)) {
 115                                 die("invalid quoting");
 116                         }
 117                         path = p_uq.buf;
 118                 }
 119
 120                 append_to_tree(mode, sha1, path);
 121         }
 122         strbuf_release(&p_uq);
 123         strbuf_release(&sb);
 124
 125         write_tree(sha1);
 126         puts(sha1_to_hex(sha1));
 127         exit(0);
 128 }